Syringe



K. KUPPERs SYRINGE Filed Auf. 1a. 1924 F y .i

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Patented Nev. 17, 1925.

UNITED STATES KARL KPPERS, OF AACHEN, GERMANY.

SYRINGE.

Application filed August 18, 1924. Serial No. 732,834.

To all whom t may concern.'

Be it known that I, KARL Krrnns, a citizen of Germany, and residing at 58 Hubertusstrasse, Aachen, Germany have iuvented certain new and useful Improve- A Fig. l.

ments in Syringes (for which I have tiled an application in Germany, July 9, i923), of' which the following is aspecilication.

The subject of this invention is a simplified type of'syringe having a replaceable cylinder or replaceable fittings, the arrange-- ment being such that, should the glass cylinder be broken, only the latter need be replaced, while the whole of the fittings with the plunger can be used again and again.

In Figs. 1 and 2 ot' the accompanying drawing two constructional examples ot' a syringe according to the invention are shown both in section and l Fig. 3 shows an arrangement for guiding the plunger rod.

According to Fig. l the lower end of the glass cylinder a is provided with an internal conical part Y). In the said conical part is placed a stopper c with a nozzle (l. The two latter parts may be made in one piece. The nozzle part cl is provided with an external thread, on which a disc e is screwed, which rests against the end of the glass cylinder, draws the externally coned stopper into the conical part I) and thereby makes a tight joint.

To the disc e are fixed two resilient longitudinal clamping members h, (any number of such clamping members may be used), the inwardly bent upper ends 7a of which extendover the upper edge of the glass cylinder and act as stop members for limiting the stroke of the plunger, which is not shown in The outwardly bent members 71.2 serve the purpose of handles.

In the constructional example shown in Fig. 2 the lower end of the glass cylinder a is provided with an internal shoulder f, on which a corresponding annular projection on the stopper c rests. The stopper is fixed in the same manner by means of the disc e, which is screwed on to the nozzle part l and in this constructional form is provided with only one resilient longitudinal clamping member having a hooked part 7L for limiting the` stroke of the plunger 7c with the rod 7c.

Fig. 3 shows an upper closure for the glass cylinder a. This consists of the outer bush y having an internally coned lower edge Z and an upper external flange z', which rests f on the upper end of theglass cylinder. The

lower partA of the bush Z is provided with slits s, so that it can expand and press against the glass cylinder. Into the bush y' is screwed by means of' the thread m3 a sleeve m having a part m for guiding the plunger rod and a handle m2, the lower externally coned end of the said sleeve being adapted to spread the bush j in sucha manner that the latter will be pressed against the glass cylinder, the parts being sufficiently firmly fixed for practical purposes.

By unscrewing or releasing the sleeve m the bush y' is released, so that it can be withdrawn from the glass cylinder. The nozzle with the parts for fixing it, shown in Figs. `1 and .2, may be detached from the glass cylinder in asimilar manner. It is only necessary to unscrew the disc c, when the stopper becomes tree, so that it can be slid out of the glass cylinder, on the latter being suitably held. The upper closure for the glass cylinder shown in Fig. 8 may be replaced by a simple cap, which is fixed to the glass cylinder by means of a screw thread or a bayonet catch.

It is of course not necessary for the disc e to be fixed to the nozzle part d by means ot a. screw thread. A bayonet catch may be used for this purpose, the pin member of which follows a` helical path.

What I claim is:

A syringe comprising a removable glass cylinder (a) a stopper (c) within said cylinder, a nozzle (d) fixed in the stopper, a surface (b) arranged on the end of the glass cylinder and serving to effect a tight joint v between the stopper and the barrel, a transverse member abutting against the end of the cylinder, inter-engaging means on the nozzle and the transverse member for drawing the stopper and vtransverse member together, whereby the stopper is secured in position in the cylinder, and resilient means (h) on the transverse member having inwardly bent parts (L) for limiting the stroke of the plunger and outwardly bent members (h2) serving as handles.

In testimony whereof I have signed my name to this speciiication.

KARL KPPER-S. 

